I blowed up the DemonFish®, blowed him up good. Also got the magic whatever "dhole" [dog]. The cheat sheet I read about hunting exotic animals: when there's a whole pack of 'em, it's legal to kill all the others with any weapon of your choosing, you just have to kill the target animal(s) with the specified weapon. So that makes it a whole lot easier.
I ended up on the roof shooting the dhole full of arrows (IIRC, it took 4 or 5) from a safe distance after dispatching his pack brethren with the sawed-off sidearm shotgun up close (a truly spectacular weapon), and sniper rifle from a distance.
EDITED: 6 Dec 2018 15:16 by DSMITHHFX